Prepare for ONGC Assistant Technician (Electrical) and Junior Technician recruitment examination with official previous years' solved question papers across Basic Electrical Principles & Ohm's/Kirchhoff's Laws, Magnetism & Electromagnetic Induction, AC Fundamentals & Polyphase Circuits, Transformers & Substation Maintenance, DC Machines & 3-Phase Induction Motors, Synchronous Alternators & Rig Power Generation, Motor Control Centres (MCC) & Switchgear Protection, Flameproof (Ex-d) Equipment for Oil & Gas Hazardous Areas, Underground Power Cabling, Electrical Measuring Instruments, Industrial Earthing Systems, and Workshop Electrical Safety Standards.
Marking pattern: +1.00 positive, 0.00 negative marking (Official ONGC CBT Scheme — No Negative Marking; 100 Questions, 100 Marks).
The equipment which essentially heats feed water is called:
In a fuse, the rms value of the first loop of the fault current is called:
The maximum efficiency of full wave rectification is:
Why are core transformers preferred over shell type transformers for high voltages?
A synchronous machine not driving any mechanical load and working on leading power factor is called:
In an atom, if some extra energy is provided, an electron transitions to a higher orbit. Such an atom is said to be in a state of:
In gasification, heating of biomass with about one-third of oxygen is necessary for complete combustion. This combustion produces a mixture of carbon dioxide and hydrogen gas known as:
In pure metals, when the temperature increases, its:
The total solar radiation on horizontal surface is often referred to as:
The current drawn by an induction motor when running at no load is generally:
On which factor does the development of maximum power in a synchronous motor depend?
In carbon composition resistance, the silver band represents:
If the supply frequency and voltage of a three phase induction motor is reduced to half:
In a relay, the time during which the stored operating energy is dissipated after the characteristic quantity has been suddenly restored from a specified value to the value which it had at the initial position of the relay is called:
Which process does an electrovalent compound in water undergo for production of an equal number of positively and negatively charged ions?
The ratio of puncture strength to flashover voltage is known as:
In an induction relay, the inverse-time delay can be achieved by providing:
Determine the frequency of an alternating current, if current is represented by $I = 637\sin(471t)$.
The ratio of maximum demand of the group to sum of the individual maximum demands is called:
In the closed position of a Sulphur Hexafluoride ($\text{SF}_6$) circuit breaker, the contacts are surrounded by Sulphur Hexafluoride gas at a pressure of approximately:
Which factor limits the maximum load that a power transformer can carry?
Which of the following instruments can sense temperature?
From the following, which multivibrator is a one-shot multivibrator?
When the potential difference between two charges forces a third charge to flow, that flow of the third charge is called:
How many electrons does K-orbit of copper atom consist of?